<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>小学数学练习系统</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="container">
        <h1>小学数学练习系统</h1>
        
        <div class="controls">
            <select id="grade-select">
                <option value="">请选择年级</option>
                <option value="1">一年级</option>
                <option value="2">二年级</option>
                <option value="3">三年级</option>
            </select>
            <button id="submit-all">提交答案</button>
        </div>

        <div id="problems-container"></div>
        
        <div id="score"></div>
    </div>

    <script src="app.js"></script>
</body>
</html>